Proofreading and polishing the Chinese translation

[Eroyi]

• Proofread several confusing strings.
• Add space between full-width and half-width characters.
• Expanding the note about setting Password, specify its the lockscreen password
• Rewrite several "RSSI" strings as the original text could cause difficulties in comprehension
• Correct the "Now Playing" description as it will pause the audio instead of "Music" only.